UL 813

These requirements cover power-operated audio equipment and accessories, rated 300 volts or less, that are intended for use in commercial enterprises or establishments and other locations such as churches, schools, theaters, and factories. This equipment is for use on supply circuits in accordance with the National Electrical Code, NFPA 70 .

Commercial audio equipment includes amplifiers, preamplifiers, mixers, signal processors, public address and centralized sound systems, intercommunicating devices and systems, phonographs, tape players, and recorders, radio receivers, tuners, and tuner-amplifiers, power supplies intended for use with commercial sound systems, special effects units, and integral amplifier-speakers.

These requirements also cover accessories for use with commercial audio equipment such as tape erasers and head demagnetizers.

These requirements do not cover equipment that is covered by individual requirements separate from this standard such as:

— 1.Dictating and transcribing machines for office use;

— 2.Musical instruments and accessories for non-professional use;

— 3.Household type amplifiers, tuner-amplifiers, phonographs, radio receivers, and recorders; and

— 4.Amateur radio equipment.